Suction valve



April 27, 1937. M. s. SHEPHERD ET AL 2,073,347

SUCTION VALVE w Original Filed Feb. 25, 1932 Patented Apr. 27, 1937'UNITED STATES PATENT OFFICE V SUCTION VALVE Milton S; Shepherd andFrancis 0." Wiley, Salt Lake City, Utah, assignors of one-third to LouisA. Roser, Salt Lake City, Utah Original application February 23, 1932,Serial No.

594,443. Divided and this application November8, 1934, SerialNo. 752,068

3 Claims. (01. 230- 221) Our invention relates to compressors and hasfor its object to provide a new and efiicient fluid compressor for useprimarily in refrigeration machines. r

A further object is to provide a compressor which has a new type ofnoiseless suction valve and which valve is more eflicient than thoseheretofore, giving greater compressibility to any type of compressorwhen used therein. 19 A still further object is to provide a simplifiedconstruction of suction valve in which air cushionsand air pressure areused to stabilize the operation of the valve and to make it noiseless inoperation.

A still further object is to provide a construction of intake or suctionvalve which is'so built asto have longer life and to prevent poundingoif of the lock' nut thereon.

A still further object is to provide a compressor which has the suctionvalve so constructed that when starting, no load is carried until thecompressor has attained suificient speed to close the suction valve inthe piston.

These objects we accomplish with the device illustrated in theaccompanying drawing in which similar numerals and letters of referenceindicate like parts throughout the several views and as described in thespecification forming a part of this application and pointed out in theap- 30 pended claims.

This application is a division .of our former application filed Feb. 23,1932, Serial Number 594,443, now Patent No. 1,985,481, of Dec. 25th,1934, for Compressors.

In the drawing in which We have shown the best and most preferred mannerof building our invention,

Figure 1 is a vertical diametrical section of a compressor piston andcylinder with our suction 40 valve used in the piston head.

Figure 2 is a vertical diametrical section through the suction valve andcage removed from the piston.

Figure 3 is a section of the valve cage. 45 Figure 4 is a side elevationof the valve cage and valve.

Figure 5 is a plan view of Figure 3.

Figure 6 is an enlarged section of one edge of the valve and valve seatto show the double converging angle formed in both the valve and seat.

In the drawing we have shown the cylinder as A, the piston as B, and thesuction or intake valve as D.

55 The suction valve D is carried in a cage 25 I single ,chamfer.

which cage is cylindrical in form with a valve seat formed in the topendin which the valve D is normally held away from its seat by the springDI. The cage 25 is provided with a flange 26 therearound-adapted to fitinto a socket 21 in the piston head B, and be. secured therein byplacing an annular ring 28 thereabove resting on the flange 26 andfitting into an annular step '29 inthe piston head. The ring is'securedby spaced apart tap screws 30.

The bottom end of the cage 25 is formed as an inverted frustum of a coneand the center is bored out to leave an inverted frusto-conical chamber3| therein and a vertical frusto-conical v valve'stem support bearing 32is formed concentric within the inverted frusto-conical chamber 3| tosupport the valve stem D2. The bottom end of the frusto-conical portionof the cage 25 is bored concentric therewith to form a cylinder 33'inwhich a piston 34 is carried and operated. A central bore 35 isprovided up throughthe center of the entire cage, and center supportbearing 32, in which the valve stem of the valve D is carried, and thelower end of the stem D2 extends down through this bore 35 into thecylinder 33 and passes through a center threaded hole in the piston 34;A pin 36 secures the piston 34 onto the lower end of the stem D2. Thusthe operations of the valve D are controlled by the retarded action ofthe piston in the cylinder.

A small relief port 31 is bored into the cylinder 33 through the sidewall of the cage 25 into the cylinder 33 near the top end thereof. Therelief port is to allow air to be forced from the cylinder when thevalve is opening, but the port 31 is bored into the chamber a shortdistance from the end thereof so that the piston when rising in thecylinder moves freely until just before it reaches the end of its strokeand the end of the stroke will be cushioned by the compression of theair in the chamber 31 above the piston 32. The top inner edge of thebearing block 32 is inwardly chamfered at 38 to provide an oil retainingwell to catch and retain oil for lubrication of the valve stem. Ports 39through the side walls of the cage 25 provide air passage thereinto fromthe space surrounding'the piston into the cylinder A.

The valve D and its seat 40 are each cut with their faces made of twoangled chamfers so that they will seat more closely than possible withone The two chamfers in the head are shown as 4| and 42 and those in theseat as 43 and 44. These two sets of chamfers fit into each other whenthe valve is resting in its seat thereby providing a perfect non-leakingvalve. The valve spring DI is carried in the chamber 3| surrounding thebase of the frustum 32, and engaging the bottom of the valve D.

The piston B of the device is of the usual compressor type having a headand skirt joined together by vertical struts leaving an air spacebetween the skirt and head Which space is joined into the circuit of thesystem in which the compressor is being used or to the atmosphere if airis being compressed.

Having thus described our invention we desire to secure by LettersPatent and claim:

1. In a compressor suction valve, the combination of a piston; a valvecage carried therein; a ring to secure the cage to the piston; a suctionvalve mounted in the head of the cage with the face of the valve and theface of the valve seat formed with two converging angles; a smallcushioning cylinder formed in the bottom end of the frusto-conical lowerend of the valve case; a small piston carried in said cushioningcylinder with the stem of the suction valve secured through said smallpiston; an escape port through the cage near the top end of the smallcushioning cylinder to allow for closing of the valve against airsuction and pressure and affording a quick operating valve; and a springcarried in said cage engaging the cage and valve to normally hold thevalve slightly away from its seat.

2. A suction valve for compressors, comprising a step out cage adaptedto fit into the piston head of the compressor; a frusto-conical cagedepending therefrom having a cylinder in the bottom end thereof; acentral upwardly extending frustoconical valve stem guide formed withinsaid cage; openings through the wall of the frusto-conical dependingcage to allow fluid to pass into the valve chamber which is formedwithin the cage; a valve seat formed in the head of the cage having theseat of twoangled chamfers joined medially of the seat; a valve carriedin said cage having the face formed of like angled chamfers to fit thevalve seat and having the stem depending through the valve stem guide; apiston secured onto the lower end of the valve stem to operate withinsaid cylinder in the bottom of the cage; a spring to normally hold thevalve spaced from the valve seat, but of a tension to allow the valve toseat when the piston is operating at sufficient speed to close the valveand compress the fluids thereover; and a bleeder hole through the cageinto the cylinder near the top end thereof to dampen the movements ofthe valve but to prevent pressure locking of the valve.

3. In a compressor valve of the type described, the combination of acylinder having a compression piston operable therein, said pistonhaving a step out opening medially therethrough; a valve cage having astep out flange around the perimieter thereof fitting into the step outin the piston and a depending frusto-conical body below said flange; anannular ring secured above the flange and to the piston to hold the cagewithin the piston; a frusto-conical opening in said cage with the topedge chamfered to form the valve seat; a frusto-conical valve stem guideformed within the opening in the cage to guide the valve and having thetop end of the guide chamfered' inwardly to catch oil for lubricatingthe valve stem; a small cushion cylinder formed in the bottom end of thecage; a valve carried through a central bore in said cage and guide withthe valve to seat in the valve seatformed in the top of the cage whencompressing; a spring carried in the opening in the cage to normallyhold the valve from its seat; and a small piston carried in said cushioncylinder in thebottom of the cage with the valve stem'secured to thepiston to retard the closing and opening of the valve.

FRANCIS C. WILEY. MILTON S. SHEPHERD.

